linux-kernel - Re: of overlay: how to insert new nodes with references to it

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Date:   Thu, 18 Feb 2021 13:19:11 +0100
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: of overlay: how to insert new nodes with references to it

On 18.02.21 10:14, Enrico Weigelt, metux IT consult wrote:

Hi folks,


answering myself ;-)

> Problem: dtc adds my new 'gpio1' node to the __fixups__ list, which is
> used for resolving symbols against the live tree - obviously it can't
> exist there, since it's added by the overlay. Therefore applying the
> overlay fails:
> 
>      "OF: resolver: node label 'gpio1' not found in live devicetree
>       symbols table"
> 
> Shouldn't the symbol be added to __local_fixups__ instead of __fixups__
> ?
> How can I force dtc to do that ?

after playing around a while, found out that I need to use full path
references instead of labels or just node names, eg.

     gpios = <&{/fragment@..._overlay__/gpio1} 0 GPIO_ACTIVE_HIGH>;


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287